How do thermostatic heads work?

COMAP thermostatic heads are comprised of a sensor element that expands and contracts depending on the room temperature. The assembly exerts pressure on the needle of the thermostatic valve (upon which the head is mounted), opening and closing the flapper. It allows water to pass through the radiator when the temperature detected in the room is lower than the temperature selected by the user, and closes the flapper when the desired temperature is attained.

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